2155140330240 has 144 divisors (see below), whose sum is σ = 6884297699328. Its totient is φ = 574594019328.

The previous prime is 2155140330197. The next prime is 2155140330257. The reversal of 2155140330240 is 420330415512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2155140330198 and 2155140330207.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21080527 + ... + 21182513.

It is an arithmetic number, because the mean of its divisors is an integer number (47807622912).

Almost surely, 2^{2155140330240} is an apocalyptic number.

2155140330240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155140330240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3442148849664).

2155140330240 is an abundant number, since it is smaller than the sum of its proper divisors (4729157369088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2155140330240 is a wasteful number, since it uses less digits than its factorization.

2155140330240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107514 (or 107500 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 2155140330240 its reverse (420330415512), we get a palindrome (2575470745752).

The spelling of 2155140330240 in words is "two trillion, one hundred fifty-five billion, one hundred forty million, three hundred thirty thousand, two hundred forty".